Chapter
Apr 25, 2016
Appendix L
Comparison and Ranking of Methods for Estimating ET
Publication: Evaporation, Evapotranspiration, and Irrigation Water Requirements
Abstract
This appendix compares and ranks various methods of estimating evapotranspiration (ET). The methods include the Penman method, the Priestley-Taylor and Turc methods, the FAO Blaney-Criddle temperature method, the Hargreaves-Samani method, and pan evaporation methods. Data used to evaluate the various methods were selected from publications or obtained by personal communication with investigators working where lysimeter data for well-watered grass or alfalfa were available along with adequate supporting climatic data. Most methods of estimating evapotranspiration require the computation of parameters such as saturation vapor pressure, latent heat of vaporization, the psychrometric constant, etc., from climatic data. This appendix presents ET estimates for 16 methods expressed as percentages of the corresponding lysimeter-measured ET for peak ET months for 11 lysimeter locations. The analyses and comparisons of methods were made over a broad range of climates and geographic locations.
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© 2016 American Society of Civil Engineers.
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Published online: Apr 25, 2016
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